In the original ending, a human watches as a robot recognizes that conscious life is the most precious of all and chooses to spare the human life that he was just about to end. Given this recognition, the human returns to the female robot and attempts to take her to safety; thus, recognizing the importance of her life. This is a pretty powerful way of saying that these robots had attained human consciousness and life.
If the ending is altered so that our hero is now a robot, you have exactly the same equation except that the human has been removed. In this ending, our hero, the robot policeman unaware that he is a robot, becomes aware of the preciousness of human life. OK, so, that adds what to the story?





